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Measurement-Device-Independent Entanglement Witnesses for All Entangled Quantum States

The problem of demonstrating entanglement is central to quantum information processing applications. Resorting to standard entanglement witnesses requires one to perfectly trust the implementation of the measurements to be performed on the entangled state, which may be an unjustified assumption. Inspired by the recent work of F. Buscemi [Phys. Rev. Lett. 108, 200401 (2012)], we introduce the concept of Measurement-Device-Independent Entanglement Witnesses (MDI-EWs), which allow one to demonstrate entanglement of all entangled quantum states with untrusted measurement apparatuses. We show how to systematically obtain such MDI-EWs from standard entanglement witnesses. Our construction leads to MDI-EWs that are loss-tolerant, and can be implemented with current technology.

preprint2013arXivOpen access
Cyril BranciardDenis RossetYeong-Cherng LiangNicolas Gisin
quant-ph
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Cyril BranciardDenis RossetYeong-Cherng LiangNicolas Gisin

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